Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46836b43c4f9d47…

MALICIOUS

PDF

79.2 KB Created: 2021-09-09 13:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fee3fe8e2a5f5dd6ebbb1a4ed2068ca3 SHA-1: c801071b68a5fba7b0f013946e839a51a626e3a3 SHA-256: b46836b43c4f9d4783f37430c3d5866df156c5b77e127c080ebc5a45714388f4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. The heuristics indicate it functions as a link farm with disposable hosting and contains urgency lures and download buttons, suggesting a phishing or malware distribution attempt. While no scripts were extracted, the overall structure and detection results point to a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://holdemigny.fr/ckfinder/userfiles/files/72654946191.pdf In PDF document text
    • https://tidurmalam.com/contents/files/13943740019.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/tupig.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/podebavisunibibov.pdfIn PDF document text
    • http://ossokahve.com/upload/file/watuxogufujepubovivuvenib.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/87691708235.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/jididagaj.pdfIn PDF document text
    • http://generoussecurity.com/uploads/dinulugapuwajixez.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/pofukotufogotorusarezexo.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/luliloxip.pdfIn PDF document text
    • http://lblussana.it/images/file/5439169190.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/pefowojupagi.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/tifubezelafebit.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613727a187d3a---31654960975.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-8/20210908034830277118.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/mazafanokurilowenitigidin.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/koropadamafuve.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/28179358238.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/buwukisibuxetiwik.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/90755238901.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/mozad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=tagged+meet+chatPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 10148 bytes
SHA-256: af34ba4fde2dc170213721486fae04a87e7f8c25e967985f94c3dae8560e2097
font_02_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 17252 bytes
SHA-256: 676d0e99b223150b9c4f909e898fdeaf70b8ab1c22d198fffb7c04e7a002a8e3